A water quality team tested water in a nearby rice field not far from where the train was burning, taking samples of run-off water.

Jas Richardson and his family farm about 2,000 acres of rice and soybeans in Hoxie.

Richardson is concerned because some of his rice crop is close to where the train was burning Sunday. He said his rice crop could be in danger if water samples show any contamination.

"It could be something simple or it might be something that causes us not to be able to farm this next year. I mean, we don't know yet. But I believe what they've told us is 'we don't have to worry about it too much," said Richardson.

Union Pacific has confirmed one of the men killed is from White Hall, Ark., and the other is from McKinney, Texas.

The NTSB has recovered recorders from the crash site.

Highway 67 is closed West of Highway 63 while crews continue to investigate and remove wreckage.